The hex color #3f79f5 is a dark color. The web-safe version is Hex
#3366FF. A complementary color is
#C0860A. The grayscale version is
#8F8F8F. A 20% lighter version of the original color is
#72ACFF, and Hex
#0C46C2 is the 20% darker color. If the color is saturated by 10%, you get
#3777FF. If the color is desaturated by 10%, the color
#477BEB is obtained.